[6xy-3(xy-1/2x的平方y]/3xy=?

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[6xy-3(xy-1/2x的平方y]/3xy=?
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[6xy-3(xy-1/2x的平方y]/3xy=?
[6xy-3(xy-1/2x的平方y]/3xy=?

[6xy-3(xy-1/2x的平方y]/3xy=?
[6xy-3(xy-(x²y)/2]/3xy
=(6xy-3xy+(3x²y)/2)/3xy
=2-1+x/2
=1+x/2

[6xy-3(xy-x²y/2]/3xy=2-1+x/6=1+x/6

[6xy-3(xy-x²y/2]/3xy=2-1+x/6=1+x/6